2145431461 has 2 divisors, whose sum is σ = 2145431462. Its totient is φ = 2145431460.

The previous prime is 2145431443. The next prime is 2145431473. The reversal of 2145431461 is 1641345412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2050368961 + 95062500 = 45281^2 + 9750^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145431461 - 2⁵ = 2145431429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145431401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072715730 + 1072715731.

It is an arithmetic number, because the mean of its divisors is an integer number (1072715731).

Almost surely, 2^2145431461 is an apocalyptic number.

It is an amenable number.

2145431461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145431461 is an equidigital number, since it uses as much as digits as its factorization.

2145431461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

The square root of 2145431461 is about 46318.8024564539. The cubic root of 2145431461 is about 1289.7480550774.

Adding to 2145431461 its reverse (1641345412), we get a palindrome (3786776873).

The spelling of 2145431461 in words is "two billion, one hundred forty-five million, four hundred thirty-one thousand, four hundred sixty-one".